Carburetor



1,634,461 July 5 1927 w. GRlKscHElT I CARBURETOR Filed Sept. y25. 1922 2Sheets-Sheet 1 @woe/whoa July 5', 1927.

alter/wem Patented July 5, 1927.

UNITED STATES WILLIAM omxscnm'r, or Dn'rnorr, Niemann..

CARBURETOR.

Application med. Septembei' 25, 1922. Serial No, 590,472.

The invention'relates to carburetors and' has for one of itsl objectsthe provision of a carburetor havingmeans effected by the suctionproducing means'of the carburetor for drawing liquid fuel thereinto, andalso meansfor preventing the siphoning of the liquid fuel thereinto.Another object is to provide u carburetor provided with an emul- "fyingchamberv discharging into --the prilo mary air and with means forautomatically varying the supply ot liquid fuel and primary` air uponvariation in the pressure in the carburetor outlet. Otherobjiects of theinvention reside in the novel features of conte struction .andcombinations and arrangements ot parts as more fully hereinafter setforth.

lin the drawings:

Figures 1 and 2 are transverse cross secao tions through the carburetorvon the lines 1--1 and 2--2 respectively. y

1 is the outlet in the bodyT ofthe carburetor and 2 the primary airinlet below the outlet and communicating therewith. 3 is a throttlevalve in the-outlet and Il is a choke valveV within the primary airinlet. 5 is an upwardly extending cylindrical guide through the primaryair inlet and spaced from its side walls, and 6 is an auxiliary air tubeformi-ng the emulsifying chamber, this air tube being slidable withinthe guide 5 and having a lower open end communicating with the lateralair passage 7 in the carburetor body, which in turn opens into thevertical air passage 8 in the side wall of the chamber 9. rlhis verticalair passage communicates with the interior of the chamber through theport 10 and the interior of the chamber communicates with the atmospherethrough the port 11 located in its side wall diametrically oppositethevertical air passage 8. 12 is a gravity actuated tapering valve havingthe restricted axial passage 13 therethrough for placing the interior otthe chamber 9 into` restricted communication with the port 11 at alltimes. However, as the lsuction eiiect within the chamber 9 increases,the valve 12 raises to permit ot an increasing iiow of air into thechamber. 1li Vis they liquid fuel. tube extending upwardly withinthe'air tube 6 and spaced trom its wall to permit of the' passage olfthe auxiliary air.. 'lhe upper end ot this liquid fuel tube terminateswithin the auxiliary tube and its lower end communicates lwith thechamber 9 through the lateral fuel passage 15 the carburetor body. Theauxiliary air tube 6 is 'provided with the longitudinally spaced ports16 for placing its interior in communication with the outlet 1, theupper port-being at all times in communication with the outlet.

17 is a vertically reciprocable plunger within the cylinder 18 formed inthe carburetor body. this plunger variably restricting the communicationbetween the primary air inlet. and the outlet and its position beingdetermined by the pressure within the outlet in rear of the throttlevalve. The vertical position of the most position of the plunger isdetermined by means of the coil spring 20 surrounding the guide rod 21which extends into the plunger. 22 is a metering pin secured to theplunger and cooperating with the liquid fuel tube 14,- to variablyrestrict the flow of the liquid fuel therethrough into the emulsifyingchamber formed by the air tube 6. The air tube is also secured to theplunger, the arrangement being such that as the plunger rises, theprimary air passing through the air inlet 2 into the outlet 1 increases,the liquid fuel passing through the liquid fuel tube 14 increases, andthe mixture of this liquid fuel and the auxiliary air passing throughthe air tube 6 and entering the outlet 1 increases.

The vertical position of the liquid 'uel tube 14 relative to themetering pin 22 is manually adjustable through the lever 23 engaging thelower end of the liquid fuel tube and mounted upon the rock shaft 24towhich is connected the lever 25 operable from the dash of the motorvehicle by the exible connection 26. A coil spring 27 yieldably holdsthe liquid tuel tube in its uppermost position.

As shown in the present instance, liquid tuel is drawn into thecarburetor from the supply tank 28 by the suction producinfr means oit.the. carburetor such as an interna combustion engine, and the chamber 9forms plunger is dependent upon the difference in the pressures belowand part of the discharge connection between the tank and thecerburetor. The suction for drawing the liquid fuel from the tank issecured through the port l@ connecting the interior of Ithe chamber 9neer its upper end with the vertical air passage 8 in the side Wall ofthe chamber which in turn connects into the lateral air passage 7leading to the air tube 6. To prevent siphoning of the liquidy fuel whenthe motor vehicle is doing down hill, I have provided the oat 29 in thechamber 9 to which is secured' the valve 30` for closing the port 31into the chamber. The liquid Vfuel entering' the chamber 9 may dischargethrough'the liquid fuel tube 14 owing tothe differential pressures atthe surface of the liquid fuel -if for any reason, eiphoning of theliquid neeeeel fuel should cccur'so that it enters the. chember'fasterthan it discharges, the doet with in the chamber actuates the (valve toclose the same end prevent further eiphoning.,`

What l claim as my invention is:

In a carburetor, the combination with the body having an airy inlet unden outlet, of

a cylinder, a plungernslidablewithin said cylinder for controlling thecommunication of said air inlet with said outlet, an .air tube dependingfrom said plunger and adapted trol the iow of liquid fuel therethrough,t and means for placing the interior of seid,

cylinder in communication 'with sei-d outlet.. In testimony whereof ll,etlix my eigneturea WLLVIAM GREKSCHEEL

